Novel steel bar connecting sleeve

Abstract

The utility model provides a novel reinforcing steel bar connecting sleeve which comprises a sleeve body, two pairs of trapezoidal extrusion wedge blocks are arranged in an inner cavity and a guide groove in the middle of the sleeve body in a crossed mode, and two top shafts are symmetrically arranged on the lower bottom faces of the two first trapezoidal extrusion wedge blocks. One end of each top shaft is connected with the lower bottom surface of the corresponding first trapezoidal extrusion wedge block, and the other end of each top shaft is movably inserted into an inner cavity in one end of the sleeve body; two taper sleeves are symmetrically arranged outside the two ends of the sleeve body through threads; a self-locking inner conical surface is arranged at the outer end of the inner cavity of the conical sleeve; a compression spring and a locking plate with a multi-plate structure are arranged in an inner cavity of the taper sleeve, and the outer surface of the locking plate is a self-locking outer conical surface matched with the self-locking inner conical surface of the corresponding taper sleeve; in the initial state before steel bar connection, the locking piece is arranged at the outer end of the outer portion of the compression spring in a sleeving mode, and the compression spring is in a compressed state under the interaction of the self-locking inner conical surface and the self-locking outer conical surface. The device is easy and convenient to operate and high in connection speed, and residual deformation meets the standard.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reinforcing steel bar connecting technology field, concretely relates to a novel reinforcing steel bar connecting sleeve. BACKGROUND

[0002] In the field of nuclear power, building and other engineering, reinforcing steel bar connecting quality is related to structure safety, and connecting efficiency influences construction progress. At present, ordinary straight thread sleeve and fast inserting sleeve are used as the mainstream connecting mode, and each has obvious shortcomings. When reinforcing steel bars are connected by the ordinary straight thread sleeve, workers need to rotate many circles manually, so that the reinforcing steel bar connection reaches the specified torque requirement, the construction process is complicated, the labor intensity of workers is big, and the time consumption is long, so that the work efficiency is influenced. The fast inserting sleeve is simple in connecting operation, and the speed is fast, so that the construction efficiency can be improved to a certain extent, but it is found in practical application that the residual deformation of the reinforcing steel bar connected by the fast inserting sleeve is far more than the relevant standard requirement after bearing load, so that it is difficult to be widely used in nuclear power projects, and its application in the engineering field with high structure safety requirement is limited.

[0003] Therefore, there is an urgent need for a novel reinforcing steel bar connecting sleeve to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the technical problem in the prior art and provides a novel reinforcing steel bar connecting sleeve, which is simple in operation, fast in connecting speed and has a residual deformation meeting the standard.

[0005] To solve the above technical problems, the content of the utility model comprises:

[0006] The utility model provides a new type reinforcing steel bar connecting sleeve, which comprises a sleeve body with an axial hollow structure, two guide grooves symmetrically arranged at the middle part of the sleeve body along a second direction L2 and communicating with the inner cavity of the sleeve body, two pairs of trapezoidal extrusion wedges arranged in a cross shape in the inner cavity of the middle part of the sleeve body and the guide grooves, two first trapezoidal extrusion wedges arranged oppositely and slidably along a first direction L1, two second trapezoidal extrusion wedges arranged oppositely and slidably along the second direction L2, and the second extrusion inclined surfaces of the two second trapezoidal extrusion wedges being in contact with the first extrusion inclined surfaces of the two first trapezoidal extrusion wedges, respectively, wherein the first direction L1 is the axial center of the sleeve body, and the second direction L2 is a radial direction of the sleeve body, two top shafts are symmetrically arranged on the lower bottom surface of the two first trapezoidal extrusion wedges along the first direction L1, one end of the top shaft is connected to the lower bottom surface of the corresponding first trapezoidal extrusion wedge, and the other end of the top shaft is movably inserted into the inner cavity of one end of the sleeve body, two tapered sleeves are symmetrically arranged on the outer part of the two ends of the sleeve body by threads, a self-locking inner tapered surface is arranged at the outer end of the inner cavity of the tapered sleeve, a compression spring and a locking piece are arranged in the inner cavity of the tapered sleeve along the first direction L1, the locking piece has a multi-piece structure, the outer surface of the locking piece is a self-locking outer tapered surface matched with the self-locking inner tapered surface of the corresponding tapered sleeve, the inner diameter of the compression spring is equal to the diameter of the outer end of the inner cavity of one end of the sleeve body, the inner diameter of the compression spring is slightly larger than the outer diameter of the reinforcing steel bar to be connected, and the inner diameter of the locking piece is equal to the outer diameter of the compression spring, in an initial state before the reinforcing steel bars are connected, the locking piece is sleeved on the outer part of the compression spring, and the compression spring is in a compressed state through the interaction of the self-locking inner tapered surface and the self-locking outer tapered surface.

[0007] Further, the sleeve body has a cylindrical shape, and external threads are arranged at the two ends of the outer part of the sleeve body, and the inner end of the inner cavity of the tapered sleeve is provided with internal threads matched with the external threads.

[0008] Further, a cylindrical groove is arranged at the middle part of the first trapezoidal extrusion wedge along the first direction L1, and one end of the top shaft is inserted into the corresponding cylindrical groove.

[0009] Further, the two second trapezoidal extrusion wedges are connected through a fastening bolt arranged along the second direction L2, a fastening bolt counterbore is arranged at the middle part of one of the second trapezoidal extrusion wedges along the second direction L2, and a fixing threaded hole is arranged at the middle part of the other second trapezoidal extrusion wedge along the second direction L2.

[0010] Further, the inner surface of the locking piece is provided with a plurality of annular engagement teeth.

[0011] Further, the inner cavities of both ends of the sleeve body each comprise a large guide hole and a small guide hole in a cylindrical shape; the top shaft has a large guide cylinder and a small guide cylinder, and the large guide cylinder and the small guide cylinder are matched with the corresponding large guide hole and small guide hole respectively; the inner diameter of the compression spring is equal to the diameter of the large guide hole.

[0012] Further, in the initial state before the steel bar connection, the outer end of the large guide cylinder of the top shaft protrudes from the outer end of the corresponding large guide hole.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides a novel steel bar connecting sleeve which can realize efficient connection, reduce the labor intensity of workers and ensure that the residual deformation meets the standard.

[0015] The second extrusion inclined surface of the second trapezoidal extrusion wedge and the first extrusion inclined surface of the first trapezoidal extrusion wedge are in contact with each other, when the second trapezoidal extrusion wedge slides relatively, the radial force can be converted into axial force, the top shaft is pushed to make the force act uniformly on the steel bar, and local stress concentration is avoided to produce residual deformation. And the gradual steel bar clamping is realized through the inclined surface extrusion of the two pairs of trapezoidal extrusion wedges, the size and action process of the force can be controlled better, and the excessive deformation of the steel bar and the sleeve body caused by the instantaneous excessive extrusion force is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the schematic view of the utility model steel bar connecting sleeve before installation;

[0017] Figure 2 It is the schematic view of the utility model steel bar connecting sleeve after installation;

[0018] Figure 3 It is the schematic view of the utility model sleeve body;

[0019] Figure 4 It is Figure 3 A-A sectional view of it;

[0020] In the diagram: 1. Sleeve body, 11. External thread, 12. Large guide hole, 13. Small guide hole, 14. Guide groove; 2. Top shaft, 21. Large guide cylindrical part, 22. Small guide cylindrical part; 3. Second trapezoidal extrusion wedge, 31. Bolt countersunk hole, 32. Second extrusion inclined surface, 33. Fixed threaded hole; 4. Tapered sleeve, 41. Internal thread, 42. Self-locking internal tapered surface; 5. Locking plate, 51. Engaging tooth, 52. Self-locking external tapered surface; 6. First trapezoidal extrusion wedge, 61. First extrusion inclined surface, 62. Cylindrical groove; 7. Fastening bolt, 8. Compression spring, 9. Fixed end reinforcing bar, 10. Movable end reinforcing bar. Detailed Implementation

[0021] To facilitate understanding of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that the described embodiments are merely illustrative and should not be construed as limiting the scope of this utility model.

[0022] like Figures 1-3 As shown, this utility model provides a novel rebar connecting sleeve, including a sleeve body 1 with an axially hollow structure. Two guide grooves 14, each communicating with the inner cavity of the sleeve body 1, are symmetrically formed in the middle portion of the sleeve body 1 along a second direction L2. Two pairs of trapezoidal compression wedges are arranged in a cross shape within the inner cavity and guide grooves 14 of the middle portion of the sleeve body 1. Two first trapezoidal compression wedges 6 are slidably arranged opposite each other along a first direction L1, and two second trapezoidal compression wedges 3 are slidably arranged opposite each other along a second direction L2. The second compression slopes 32 of the two second trapezoidal compression wedges 3 are in contact with the first compression slopes 61 of the two first trapezoidal compression wedges 6. The first direction L1 is the axis of the sleeve body 1, and the second direction is a radial direction of the sleeve body 1. Two top shafts 2 are symmetrically arranged on the lower bottom surfaces of the two first trapezoidal compression wedges 6 along the first direction L1. One end of shaft 2 is connected to the lower bottom surface of the corresponding first trapezoidal extrusion wedge 6, and the other end of top shaft 2 is movably inserted into the inner cavity of one end of sleeve body 1; two tapered sleeves 4 are symmetrically arranged on the outside of both ends of sleeve body 1 by threads; a self-locking inner tapered surface 42 is provided at the outer end of the inner cavity of tapered sleeve 4; a compression spring 8 and a locking plate 5 are arranged in the inner cavity of tapered sleeve 4 along the first direction L1, the locking plate 5 is a multi-piece structure, and the outer surface of the locking plate 5 is a self-locking outer tapered surface 52 that is adapted to the self-locking inner tapered surface 42 of the corresponding tapered sleeve 4; the inner diameter of compression spring 8 is equal to the diameter of the outer port of the inner cavity of one end of sleeve body 1, and the inner diameter of compression spring 8 is slightly larger than the outer diameter of the steel bar to be connected inserted therein, and the inner diameter of locking plate 5 is equal to the outer diameter of compression spring 8; in the initial state before steel bar connection, locking plate 5 is sleeved on the outer end of compression spring 8, and compression spring 8 is in a compressed state through the interaction of self-locking inner tapered surface 42 and self-locking outer tapered surface 52.

[0023] The sleeve body 1 is in a cylindrical shape, and the outer ends of the sleeve body 1 are provided with external threads 11, and the inner cavity of the taper sleeve 4 is provided with internal threads 41 matched with the external threads 11.

[0024] The middle part of the first trapezoidal extrusion wedge 6 is provided with a cylindrical groove 62 along the first direction L1, and one end of the top shaft 2 is inserted into the corresponding cylindrical groove 62.

[0025] The two second trapezoidal extrusion wedges 3 are connected through a fastening bolt 7 arranged along the second direction L2, and the fastening bolt 7 is used after the extrusion connection of the two steel bars is completed; the middle part of one of the second trapezoidal extrusion wedges 3 is provided with a fastening bolt counterbore 31 along the second direction L2, and the middle part of the other second trapezoidal extrusion wedge 3 is provided with a fastening screw hole 33 along the second direction L2.

[0026] The inner surface of the locking piece 5 is provided with a plurality of annular engagement teeth 51 to facilitate locking of the steel bars.

[0027] The inner cavities of the two ends of the sleeve body 1 each include a large guide hole 12 and a small guide hole 13, that is, the inner cavities of the two ends of the sleeve body 1 are in a stepped cylindrical structure with an outer thick and an inner thin; correspondingly, the top shaft 2 is also in a stepped cylindrical structure with an outer thick and an inner thin, and is inserted into the inner cavity of the sleeve body 1 from the outside to the inside. The top shaft 2 has a large guide cylindrical part 21 and a small guide cylindrical part 22, and the large guide cylindrical part 21 and the small guide cylindrical part 22 are matched with the corresponding large guide hole 12 and small guide hole 13 respectively; at this time, the inner diameter of the compression spring 8 is equal to the diameter of the large guide hole 12.

[0028] In the initial state before the steel bar connection, the outer end of the large guide cylindrical part 21 of the top shaft 2 protrudes from the outer end of the corresponding large guide hole 12, so as to facilitate installation of the compression spring 8 and the locking piece 5.

[0029] The use principle of the utility model is as follows:

[0030] When the utility model is used to connect and fix the fixed-end steel bar 9 and the movable-end steel bar 10, 1) first, the utility model is assembled into the structure as shown in the figure, Figure 1In the initial state shown, the inner end of the compression spring 8 is sleeved on the outer end of the large guide cylindrical part 21 of the corresponding top shaft 2, the lock pieces 5 of the multi-piece structure are sleeved on the outside of the corresponding compression spring 8, the two taper sleeves 4 are respectively connected to the two ends of the sleeve body 1 through threads, and the compression spring 8 is in a compressed state through the interaction of the self-locking inner taper surface 42 of the taper sleeve 4 and the self-locking outer taper surface 52 of the corresponding lock piece 5; 2) the outer end of the fixed-end steel bar 9 is inserted into one of the taper sleeves 4 until it contacts the large guide cylindrical part 21 of the corresponding top shaft 2, and then the lock piece 5 is preliminarily clamped to the fixed-end steel bar 9 under the action of the compression spring 8; 3) the outer end of the movable-end steel bar 10 is inserted into the other taper sleeve 4 until it contacts the large guide cylindrical part 21 of the corresponding top shaft 2, and the lock piece 5 is preliminarily clamped to the movable-end steel bar 10 under the action of the corresponding compression spring 8; 4) the two second trapezoidal extrusion wedges 3 are relatively slid in the guide groove 14 of the sleeve body 1 by using an extrusion tool, the radial force is converted into an axial force through the second extrusion inclined surface 32 of the second trapezoidal extrusion wedge 3 extruding the first extrusion inclined surface 61 of the first trapezoidal extrusion wedge 6, the two top shafts 2 are respectively pushed towards the fixed-end steel bar 9 and the movable-end steel bar 10, and finally the clamping and fixed connection of the fixed-end steel bar 9 and the movable-end steel bar 10 is realized through the interaction of the self-locking outer taper surface 52 of the lock piece 5 and the self-locking inner taper surface 42 of the corresponding taper sleeve 4 as the extrusion force increases; 5) after extrusion, the two second trapezoidal extrusion wedges 3 are fixed against loosening by using the fastening bolt 7.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A new type of reinforcing bar connection sleeve characterised in that, The sleeve body (1) has an axial hollow structure, and two guide grooves (14) are symmetrically opened in the middle part of the sleeve body (1) and along a second direction L2 and are communicated with the inner cavity of the sleeve body (1); two pairs of trapezoidal extrusion wedges are crossly arranged in the inner cavity of the middle part of the sleeve body (1) and the guide grooves (14), two first trapezoidal extrusion wedges (6) are oppositely and slidably arranged along a first direction L1, two second trapezoidal extrusion wedges (3) are oppositely and slidably arranged along the second direction L2, and the second extrusion inclined surfaces (32) of the two second trapezoidal extrusion wedges (3) are respectively in contact with the first extrusion inclined surfaces (61) of the two first trapezoidal extrusion wedges (6); the first direction L1 is the axis of the sleeve body (1), and the second direction is a radial direction of the sleeve body (1); two top shafts (2) are symmetrically arranged on the lower bottom surface of the two first trapezoidal extrusion wedges (6) and along the first direction L1; one end of the top shaft (2) is connected with the lower bottom surface of the corresponding first trapezoidal extrusion wedge (6), and the other end of the top shaft (2) is movably inserted into the inner cavity of one end of the sleeve body (1); two taper sleeves (4) are symmetrically arranged on the outer part of the two ends of the sleeve body (1) through threads; a self-locking inner taper surface (42) is arranged on the outer end of the inner cavity of the taper sleeve (4); a compression spring (8) and a locking piece (5) are arranged in the inner cavity of the taper sleeve (4) and along the first direction L1, the locking piece (5) has a multi-piece structure, and the outer surface of the locking piece (5) is a self-locking outer taper surface (52) matched with the self-locking inner taper surface (42) of the corresponding taper sleeve (4); the inner diameter of the compression spring (8) is equal to the diameter of the outer end of the inner cavity of one end of the sleeve body (1), and the inner diameter of the compression spring (8) is slightly larger than the outer diameter of the steel bar to be connected and inserted therein; the inner diameter of the locking piece (5) is equal to the outer diameter of the compression spring (8); in the initial state before the steel bar is connected, the locking piece (5) is sleeved on the outer part of the compression spring (8), and through the interaction of the self-locking inner taper surface (42) and the self-locking outer taper surface (52), the compression spring (8) is in a compressed state.

2. A new type of reinforcing bar coupling sleeve according to claim 1, characterized in that, The sleeve body (1) has a cylindrical shape, and outer threads (11) are arranged on the outer ends of the sleeve body (1); inner threads (41) matched with the outer threads (11) are arranged on the inner end of the inner cavity of the taper sleeve (4).

3. A new type of reinforcing bar coupling sleeve according to claim 1, characterized in that, A cylindrical groove (62) is arranged in the middle part of the first trapezoidal extrusion wedge (6) and along the first direction L1, and one end of the top shaft (2) is inserted into the corresponding cylindrical groove (62).

4. A new type of reinforcing bar coupling sleeve according to claim 1, characterized in that, The two second trapezoidal extrusion wedges (3) are connected through a fastening bolt (7) arranged along the second direction L2; a fastening bolt counterbore (31) is arranged in the middle part of one of the second trapezoidal extrusion wedges (3) and along the second direction L2, and a fixing threaded hole (33) is arranged in the middle part of the other second trapezoidal extrusion wedge (3) and along the second direction L2.

5. A new type of reinforcing bar coupling sleeve according to claim 1, characterized in that, The inner surface of the locking piece (5) is provided with a plurality of annular engagement teeth (51).

6. A new type of reinforcing bar coupling sleeve according to claim 1, characterized in that, The inner cavities of both ends of the sleeve body (1) comprise large guide holes (12) and small guide holes (13) which are both cylindrical; the top shaft (2) has a large guide cylindrical part (21) and a small guide cylindrical part (22), and the large guide cylindrical part (21) and the small guide cylindrical part (22) are matched with the corresponding large guide hole (12) and small guide hole (13) respectively; the inner diameter of the compression spring (8) is equal to the diameter of the large guide hole (12).

7. A new type of reinforcing bar coupling sleeve according to claim 6, characterised in that, In the initial state before the steel bar connection, the outer end part of the large guide cylindrical part (21) of the top shaft (2) protrudes from the outer end port of the corresponding large guide hole (12).

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